Warm conditions in northern seas must match to allow salmon to swim that far, a convergence likely to be more common with climate change, scientists say
By Yereth Rosen, Alaska BeaconTwo chum salmon show the distinctive stripes that emerge after they enter freshwater to spawn. When the Northern Bering Sea, Chukchi Sea and Beaufort Sea warm together, conditions are right for Pacific salmon to swim all the way to the Western Canadian Arctic, research shows.
Conditions must line up over vast stretches of ocean for salmon to make the journey through the Bering Strait, across the Chukchi Sea and into the Canadian Beaufort Sea and the freshwater bodies upstream from it, the scientists found. For now, the appearance of Pacific salmon in Canadian Arctic waters is hard to predict, even mere months in advance, he said. “It’s going to be volatile in the near term,” he said.In 2019, a record-warm year in which ocean waters off Alaska were uniformly warm, there were abundant Pacific salmon swimming into the Canadian Arctic and harvests were high, Langan said. Three years later, when waters had turned cold, no Pacific salmon were caught in those Canadian Arctic communities, he said.
Although they are harvesting this Pacific salmon when it appears, residents of Canadian Arctic communities, some of them contributors to the new study, have some concerns about the new arrival in these waters, Dunmall said.
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